10.28.05 - October 28, 2005 Molecular Composition of Green...

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October 28, 2005 Molecular Composition of Green Plants Background Helmont’s experiment o helmont conducted an experiment in which he planted a tree and weighed the soil at the start and then 5 yrs after, when the tree had grown to full size, and the soil weighed the same thing. o He concluded that the mass of the tree must have come from the water. O18 Experiment (Lecture 18) o Mass of sugar is 180. o Mass of C6 and O6 is 168 The Process: In the leaves o CO2 goes into leaf o During the process, O2 and H2O are released into air. In the roots o Consume oxygen and water o Produce CO2, which is released into soil Review of Opening and Closing Stomata Guard cells in the stomata become turgid when water flows in, causing cells to buckle and open An electrical gradient causes the protons to be pumped out of the cell, making it hyperpolarized (negative) Proton pump makes potassium go inside of the cell Water also flows in with the potassium because of osmosis (more solutes inside). The reverse happens when stomata closes.
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10.28.05 - October 28, 2005 Molecular Composition of Green...

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